Number group Earliest known date Front design Designator ------------------------------------------------------------------------------------ 48,000,001 January 2008 Handy Hints T-d1 to T-d4 to 48,100,000 48,100,001 February 2008 Handy Hints T-c1 to T-c4 to 48,200,000 48,200,001 January 2008 ? Handy Hints T-c1 to T-c4 to 48,300,000 48,300,001 November 2007 Handy Hints T-c1 to T-c4 to 48,400,000 48,400,001 November 2007 ? Handy Hints T-c1 to T-c4 to 48,500,000 48,500,001 November 2007 ? Handy Hints T-c1 to T-c4 to 48,600,000 48,600,001 November 2007 Handy Hints T-c1 to T-c4 to and T-b1 to T-b4 48,700,000 48,700,001 November 2007 ? Handy Hints T-b1 to T-b4 to 48,800,000 48,800,001 November 2007 Handy Hints T-b1 to T-b4 to 48,900,000 48,900,001 November 2007 Handy Hints T-b1 to T-b4 to 49,000,000